Pipe cutting and threading machine.



No. 722,090. PATENTED MAR. 3, 1903.

' I J. B. DUMAIS.

PIPE GUTTING'AND THBEADING MACHINE.

APPLICATION FILED AUG. 21, 1902.

no MODEL.

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in. 722,090. PATENTED MAR. a, 1903. J. B. DUMAIS.

PIPE CUTTING AND THREADING MACHINE.

APPLICATION FILED AUG. 27, 1902. no MODEL. 2 SHEETS-SHEET 2.

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UNrrJE STATES FFICE.

JEAN B. DUMAIS, OF CHICAGO, ILLINOIS, ASSIGNOR OF TWO-TIIIRDS TO JOSEPHO. VOLFF, OF CHICAGO, ILLINOIS.

PIPE CUTTING AND THREADING MACHINE.

iPECIFIGATION forming part of Letters Patent No. 722,090, dated March 3,1903.

Application filed August 27,1902- Serial No. 121,166. (No model.)

To all whom it nuty concern:

Be it known that I, J EAN B. DUMAIS, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Pipe Cutting andThreading Machines, of which the following is a specification.

One of the objects of this invention is the production of an improvedpipe cutting and threading machine.

A further object is the production of a thread-cutting machine whereinthe cuttingdies and the pipe may be rotated in contrary directions and,further, wherein either may be locked in position and the other rotated.

In the accompanying drawings, Figure 1 is a top plan viewof a pipecutting and threading machine embodying the features of my invention.Fig. 2 is a longitudinal vertical section on dotted line 2 2 of Fig. 1.Fig. 3 is a transverse vertical section on dotted line 3 3 of Fig. 1.Fig. 4 is a face view of the rotatable cutter-head, shown on dotted line4 4 of Fig. 2. Fig. 5 is a face view of the clamping-head, shown ondotted line 5 5 of Fig. 2. Fig. 6 is a view of the cutter-head with thethread-cutting die removed.

In the embodiment herein shown of this invention I provide amachine-body 1, which body may be supported upon a suitable table orframework (not shown) to raise it a convenient distance above the floor.At opposite ends of the body portion two alined bearingboxes 2 and 3 areprovided, the former for rotatably supporting the cutter-head 4, thelatter for rotatably supporting the clampinghead 5.

The cutter-head 4 is fixed with relation to a tubular stem 6, which stemis journaled in the bearing-box 2. The head 4 is provided on itsperiphery with gear-teeth, and these teeth mesh with the similar teethof the pinion 7, fixed upon the shaft 8, which shaft is rotatablyconnected with the transverse drive-shaft 9 by means of thebevel-pinions 10 and 11. The pinion 11 isa little more than twice thediameter of the pinion 10, so that the rate of rotation of the shaft 8is a little less than one to two with relation to the rotative speed ofthe drive-shaft 9.

Said shaft 9 is squared atits end to receive a crank 12. A balance-wheel(not shown) is also sometimes provided for the end of this shaft, andwhen the machine is to be operated by power a pulley (not shown) isfixed on the end of said shaft.

Upon the face of the cutter-head 4 I secure the clamping-framework 13,(shown in Fig. 4,) having the two parallel shafts 14 and 15, eachscrew-threaded right hand at one end and left hand at the opposite end.At one end of said shafts are fixed the gears 16, connected by theintermeshing gear 17, carried by the shaft 18. This shaft 18 is squaredat its upper end to receive a wrench 19 for rotating the screw-threadedshafts 14 and to move the clamping-bars 20, mounted upon opposite endsof said screw-threaded shafts. By turning the wrench 19, and thusrotating the shafts 14 and 15, these clamp-bars are made to approach orrecede, and the thread-cutting die may be clamped firmly between them.The cutter-disks 21 are rotatably mounted upon the clamping-bars 20, andby means of the adjustment just described of said bars said cutter-disksmay be moved toward or from their work.

A sliding bolt 23, lying within a suitable opening in the body portion1, is adapted to engage in one of the circular series of holes 24 formedin said cutter-head in order to hold said head in a fixed position whenits rotation is not desired.

The clamping-head 5 is fixed with relation to a tubular stem 25,rotatably supported within the bearing-box 3 of the body portion 1. Saidstem 25 is arranged to be slid backward and forward in said bearing-boxby means of a rack 26, held between the shoulder 27 on the clamping-headand the flange 28 on said stem, the teeth of said rack meshing with theteeth of a pinion 29, fixed upon a rotatable shaft 30, the upper end ofwhich shaft carries a hand-wheel 31, intended to be grasped by theoperator to feed the clamping-head toward and from the cutterhead.

The tubular stem 25 is provided in its side with a longitudinal slot 32,which slot is intended to receive a bolt 33, slidably mounted in asuitable opening in the side of the bearthe teeth of a pinion 34,slidably mounted upon but rotatably connected with a shaft 35, journaledin the lower part of the body 1. This pinion slides upon its shaft withthe movement of the clamping-head, being held in engagement with theteeth of said head by means of the side flanges 36 on said pinion.

The shaft 35 is rotated by means of the bevelgear (37) connectionbetween it and the shaft 38, extending transversely therewith, the endsof which latter shaft project from the sides of the body 1 and aresquared to receive a crank for the hand rotation of said last-mentionedshaft. It is apparent that a pulleyinstead of a crank may be placed uponthis shaft when it is desirable to operate the machine by power. Theclamping-head is provided upon its face with a clamping-frame similar tothat upon the cutter-head 4, 39 and 40 being the oppositely-threadedshafts, 41 the clamping-bars, 42 the clamping-jaws, roughened to moreeffectively grasp the pipe, 43 the gears at the ends of said shafts, and44 the intermeshing gear fixed upon the shaft 45, having a squared endfor receiving an adjusting-wrench. (Not shown.)

In order to hold the pipe centrally within the stem 25, I providebushings 46, of different sizes for the difierent diameters of pipe.

In operation a pipe to be threaded is inserted within the stem 25 of theclampinghead 5, a wrench placed upon the squared end of the shaft 45,and the clamping-jaws 42 forced downward upon the pipe. A threadcuttingdie is placed in the cutter-head, between the clamping-bars 20 thereof,and said bars adjusted to clamp the die firmly between them. Power isapplied to the shaft 9 and communicated through the gears 10, 11, and 7to the cutter-head. The clampinghead may be locked in position byinserting the bolt 33 in the slot 32 in the stem 25 of theclamping-head, or said head may be rotated in a direction contrary tothat of the cutterhead by applying power (either by crank or by belt andpulley) to the shaft 38, which power is communicated from said shaft tothe clamping-head by means of the bevel-gears 37 and the pinion 34 onthe shaft 35. The pipe held within the clamping-jaws 42 is fed forwardinto contact with the cntting-dieby means of the hand-wheel 31, theteeth of the pinion 29, fixed to the shaft 30, that supports saidhand-wheel, meshing with the rack 26. Screw-threads of any length may becut by releasing the grip of the clamping-jaws upon the pipe when theclamping-head has been fed forward to the limit of its movement,returning said head to its original position, tightening theclamping-jaws upon the pipe, and again feeding the pipe forward. This isrepeated until the desired length of thread is obtained.

When it is desirable to cut olf a portion of a pipe held in theclamping-jaws, the threadcutting die is removed, the cutting-disks setagainst the pipe at the point where the cut is desired, the bolt 23 slidinto one of the openings 24 in the cutter-head,and the clamping-headrotated. As the incision deepens, the cutting-disks are fed toward thepipe by rotating the screw-threaded shafts 14 and 15 by means of awrench set upon the squared end of the shaft 18.

By the means herein shown for separately rotating the cutter-head andthe clampinghead the effect of two speeds is obtained withoutcomplicated gear changes. To operate the machine expeditiously, twoworkmen are required, one standing at each side of the machine. Whenmanual power is employed for driving the machine, it is desirable thatboth workmen contribute to it, and to attain this result I have arrangedthe double driving means hereinbefore shown and described. On the otherhand, when the machine is to be operated by a single workman theclamping-head may readily be locked in position and only the cutter-headrotated.

It is apparent that various changes might be resorted to in the generalform and arrangement of the several parts herein described withoutdeparting from the spirit and scope of my invention, wherefore I wish tohave it understood that I do not desire to limit myself to the precisedetails set forth.

I claim as my invention 1. In a pipe-threading machine, in combination,a supporting-frame provided with a bearing-box; a tubular stem rotatablysupported in said bearing-box, said stem being provided with alongitudinal slot; a clamping-head fixed with relation to said tubularstem; means for rotating said clamping-head; a bolt slidably supportedon said framework and adapted to enter the slot in said tubular stem tolock said clamping-head from rotation; a cutter-head; means for rotatingsaid cutter head; and means for moving said clamping-head toward andfrom said cutterhead.

2. In a pipe-threading machine, in combination, a supporting-frameprovided with a bearing-box; a tubular stem rotatably supported in saidbearing-box; a clamping-head fixed with relation to said tubular stem; aflange on said stem a rack held between said clamping-head and saidflange and sliding in a groove in said bearing-box; a pinion in meshwith said rack; means for rotating said pinion; peripheral gear-teeth onsaid clamping-head; a rotatable shaft journaled in saidsupporting-frame; a pinion slidably mounted on said shaft but rotatablyconnected therewith, said pinion being provided with side flanges forholding it in engagement with the peripheral gear-teeth of saidclamping-head; and means for rotating said shaft.

3. In a pipe-threading machine, in combination, a supporting-frameprovided with two alined bearing-boxes; a tubular stem rotatablysupported in one of said bearing-boxes; a clamping-head fixed withrelation to said tubular stem; a flange on said stein; a rack heldbetween said clamping-head and said flange and sliding in agroove insaid bearingbox; a pinion in mesh with said rack; means for rotatingsaid pinion; peripheral gearteeth on said clamping-head; a rotatableshaft jonrnaled in said supporting-frame; a pinion slidably mounted onsaid shaft but rotatably connected therewith, said pinion being providedwith side flanges for holding it in engagement with the peripheralgear-teeth of said clamping-head; means for rotating said shaft; atubular stem rotatably supported in the other of said alinedbearing-boxes; a cutter-head fixed with relation to said last-mentionedtubular stern, said cutter-head being provided with a series ofopenings; a bolt slidably supported on said framework and adapted toenter one of said openings; and means for rotating said cutter-head.

JEAN B. D UMAIS.

Witnesses:

L. L. MILLER, GEO. L. CHINDAHL.

